Characterization of aluminosilicate (mullite) precursors prepared by a mechanochemical process View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1998-08

AUTHORS

J. Temuujin, K. Okada, K. J. D. MacKenzie

ABSTRACT

Aluminosilicate precursors were prepared by mechanochemical treatment of gibbsitesilica gel mixtures. The effect of grinding on their structure and thermal behavior has been examined by 27 Al and 29 Si MAS NMR, x-ray diffraction (XRD), differential thermal analysis-thermogravimetry (DTA-TG), and Fourier transform infrared (FTIR). After 8 h grinding, the hydrated alumina was completely changed to an amorphous phase which showed a new exothermic DTA peak at about 980 °C due to the formation of γ–Al 2 O 3 or spinel phase. This behavior was related to changes in the Al and Si environments, as deduced from the MAS NMR spectra. With increased grinding time, some 4-coordinated Al appears, together with an Al resonance at about 30 ppm. Simultaneously, a new Si resonance appears at about −90 ppm, indicating a greater degree of homogeneity in the ground samples. Mullite crystallizes at 1200 °C from samples ground for 8–20 h, its XRD intensity increasing with increased milling times, in agreement with the NMR, DTA, and FTIR data. Changes in the Al and Si environments during heat treatment, as reflected by the NMR spectra, are also reported. More... »

PAGES

2184-2189

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1557/jmr.1998.0305

DOI

http://dx.doi.org/10.1557/jmr.1998.0305

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035957507


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